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.Management Sciences
Category: S-BLOCK ELEMENTS
Which one of the following alkali metals forms only normal oxide when it reacts with O2 ?
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A. Lithium
B. Sodium
C. Potassium
D. Rubidium
Sodium is not observed in +2 oxidation state because of its__________________?
A. high first ionization potential
B. high second ioniation potential
C. high ionic radius
D. high electronegativity
Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________?
A. Smaller electronegativity of alkali metals
B. Smaller ionic radius of these metals
C. De-excitation of electrons from higher energy levels to low energy level
D. Excitation of electrons from low energy levels to higher energy levels
Magnesium metal does not burn in the vessel containing_______________?
A. N2
B. O2
C. N2 and O2
D. Ne
Gypsum is applied to the soil as a source of________________?
A. Ca and P
B. S and P
C. Ca and S
D. we could not apply
The ore CaSO4.H2O has the general name_______________?
A. Gypsum
B. Dolomite
C. Calcite
D. Plaster of Paris
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